Retaining ring



FIG. 1 is a perspective view of a retaining ring showing my new design;

FIG. 2 is a front view thereof, with the opposite side being a mirror image thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof, with the opposite side being a mirror image thereof; and,

FIG. 6 is a perspective view, showing the retaining ring in use.

The broken lines depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for retaining ring, as shown and described. 